package com.cheng.example.book.advise151.chap0;

/**
 * 测试 x +=y;
 */
public class Demo01 {

//    public static void main(String[] args) {
//        int x = 1;
//        int y = 2;
//        x +=y;
//        System.out.println(x);
//    }


    public static void main(String[] args) {
        String x = null;
        boolean y = (x != null) && (x.length() > 0);
    }


}
